Non-aqueous electrolyte of lithium ion battery and lithium ion battery

A lithium-ion battery, non-aqueous electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of large interface impedance, deteriorated low-temperature performance, poor electrical conductivity, etc., achieve low impedance, improve low-temperature performance, improve The effect of high temperature performance

Inactive Publication Date: 2015-12-16
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, scientific and technical workers in this field have found in their research that the passivation film formed by the three-bond phosphate additive at the electrode interface has poor conductivity, resulting in a large interface impedance, which significantly deteriorates low-temperature performance and inhibits the formation of non-aqueous lithium ions. Application of batteries in low temperature conditions

Method used

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  • Non-aqueous electrolyte of lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte of lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte of lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Preparation of electrolyte

[0043] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, then add 0.5% of compound 1 by the total mass of the electrolyte (compound 1, compound 2 referred to in the specific examples... refers to the corresponding numbered compounds listed above, Phosphate ester compounds shown in the following examples are the same), and 0.5% TMSP by the total mass of the electrolyte.

[0044] 2) Preparation of positive plate

[0045] Mix the positive electrode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.5 co 0.2 mn 0.3 o 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The slurry is uniformly coated on bo...

Embodiment 2

[0063] Except that 0.5% of compound 1 was replaced by 0.5% of compound 2 in the preparation of the electrolyte, the others were the same as in Example 1. The data of high-temperature cycle performance, high-temperature storage performance and low-temperature performance obtained from the test are shown in Table 1.

Embodiment 3

[0065] Except that 0.5% of compound 1 was replaced by 0.5% of compound 4 in the preparation of the electrolyte, the others were the same as in Example 1. The data of high-temperature cycle performance, high-temperature storage performance and low-temperature performance obtained from the test are shown in Table 1.

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Abstract

The invention discloses a non-aqueous electrolyte of a lithium ion battery and the lithium ion battery. The electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, wherein the additive comprises substances of (A) and (B): (A) is shown in the description, wherein R1, R2 and R3 are respectively and independently selected from alkyl with carbon atoms of 1to 4, and at least one of the R1, the R2 and the R3 is unsaturated alkyl containing triple bonds; and (B) tris(trimethylsilyl) phosphate. By the non-aqueous electrolyte of the lithium ion battery, disclosed by the invention, the lithium ion battery acquires low impedance, and favorable low-temperature performance and high-temperature performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolyte, in particular to a lithium-ion battery non-aqueous electrolyte and a lithium-ion battery. Background technique [0002] At present, non-aqueous electrolyte lithium-ion batteries have been increasingly used in the 3C consumer electronics market, and with the development of new energy vehicles, non-aqueous electrolyte lithium-ion batteries are also increasingly used as power supply systems for vehicles. universal. Although these non-aqueous electrolyte batteries have been put into practical use, they are still unsatisfactory in terms of durability, especially at a high temperature of 45°C with a short service life. Especially for power vehicles and energy storage systems, non-aqueous electrolyte lithium-ion batteries are required to work normally in cold regions, and high and low temperature performance must be taken into account. [0003] In non-aqueous electrolyte lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 石桥林木崇谌谷春胡时光
Owner SHENZHEN CAPCHEM TECH CO LTD
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